The Traveling Salesman Problem
In this example we’ll solve the Traveling Salesman Problem.
We’ll construct a mathematical model of the problem, implement this model in Gurobi’s Python interface, and compute and visualize an optimal solution.
Although your own business may not involve traveling salesmen, the same basic techniques used in this example can be used for many other applications like vehicle routing, circuit design and DNA sequencing.
The Traveling Salesman Problem (TSP) is one of the most famous combinatorial optimization problems. This problem is very easy to explain, but very complicated to solve – even for instances with a small number of cities. More detailed information on the TSP can be found in the book The Traveling Salesman Problem: A Computational Study , or at the TSP home page . If you are interested in the history and mathematical background of the TSP, we recommend that you watch the video by William Cook .
The origin of the traveling salesman problem is not very clear; it is mentioned in an 1832 manual for traveling salesman, which included example tours of 45 German cities but was not formulated as a mathematical problem. However, in the 1800s, mathematicians William Rowan Hamilton and Thomas Kirkman devised mathematical formulations of the problem.
It seems that the general form of the Traveling Salesman Problem was first studied by Karl Menger in Vienna and Harvard in the 1930s.
The problem became more and more popular in the 1950s and 1960s. In particular, George Dantzig, D. Ray Fulkerson, and Selmer M. Johnson at the RAND Corporation solved the 48-state problem by formulating it as a linear programming problem. The methods they described in their paper on this topic set the foundation for future work in combinatorial optimization, especially highlighting the importance of cutting planes.
In the early 1970s, the concept of P vs. NP problems created excitement in the theoretical computer science community. In 1972, Richard Karp demonstrated that the Hamiltonian cycle problem was NP-complete, implying that the traveling salesman problem was NP-hard.
Increasingly sophisticated codes led to rapid increases in the sizes of the traveling salesman problems solved. Dantzig, Fulkerson, and Johnson had solved a 48-city instance of the problem in 1954. Martin Grötschel more than doubled this 23 years later, solving a 120-city instance in 1977. Harlan Crowder and Manfred W. Padberg again more than doubled this in just 3 years, with a 318-city solution.
In 1987, rapid improvements were made, culminating in a 2,392-city solution by Padberg and Giovanni Rinaldi. In the following two decades, great strides were made with David L. Applegate, Robert E. Bixby, Vasek Chvátal, & William J. Cook solving a 3,308-city instance in 1992, a 7,397-city instance in 1994, a 24,978-city instance in 2004, and an 85,900-city instance in 2006 – which is the largest 2-D Euclidean TSP instance ever solved. William Cook et. al. wrote a program called Concorde TSP Solver for solving the TSP . Concorde is a computer code for the symmetric TSP and some related network optimization problems. The code is written in the ANSI C programming language and it has been used to obtain the optimal solutions to the full set of 110 TSPLIB instances, the largest instance is a 109,399 node 3-D “star” instance.
The continued interest in the TSP can be explained by its success as a general engine of discovery and a steady stream of new applications. Some of the general applications of the TSP are as follows:
- Scheduling and routing problems.
- Genome sequencing.
- Drilling problems.
- Aiming telescopes and x-rays.
- Data clustering.
- Machine scheduling.
We use this classic combinatorial optimization problem to demonstrate how Gurobi can be used to easily and effectively solve small-sized problem instances of the TSP. However, in order to be able to solve larger instances, one needs more sophisticated techniques – such as those implemented in the Concord TSP Solver.
- D. L. Applegate, R. E. Bixby, V. Chvatal and W. J. Cook , The Traveling Salesman Problem: A Computational Study, Princeton University Press, Princeton, 2006.
Access the Traveling Salesman Problem
To access the Traveling Salesman Problem demo application and create your scenario using your own data from a blank template or to play with existing default scenarios, you must first register for a Gurobi website account and then view the demo.